Undercut-saw guide.



J. W. DONAHUE.

UNDERGUT SAW GUIDE.

APPLICATION FILED MAY 21, 1912.

Patented Feb. 25, 1913.

INVENTOR W. Do n a h u 6: Br J @J/WVJQZSS 'firomlm IEIIIIIIIII ll i to weaken the same.

human saiatrns ra rnn'r orange.

trimester-saw GUIDE.

Application filed map at,

To all whom it may concern Be itknown that I, JAMEEL W. Dom-uteri, a citizen of the United States, and a resident of .Pe Ell, in the county 0t Lewis and State of lvashington, have invented a new and Improved Undercut-Saw Guide, of which the following is a full, clear, and exact description.

My invention relates to ed to so support the saw at the under side of the inverted.

Devices of this character include generally a spike or dog to be driven into the side of the log, and a guide arm adjustable on the shank of the spike and carrying a friction roller forming a rest and guide for the inverted cross-cut saw.

An object of my invention is to provide a guide capable of such adjustments as to enablethe saw to fOl'Ill a kerf in a con'zplete circle around'the log.

A further object of my invention is to provide tor the various adjustments of the guide arm on the shank of the spike without forming holes or slots in the said shank,

saw guides adaptas to term a kert log; with the saw A further object of my invention is to construct the saw-guide of elements simple in form and possessing the maximum of strength, and by means of which the adjustments may be made with convenience and despatch.

The invention will be particularly explained in the specific description hereinafter to be given.

Reference is to be had to the aceompanying drawings forming a part of this speei-- fication, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a perspective view of my improved saw guide; Fig. 2 is an elevations-d section; and Fig. 3 is a side elevation showing the device in use on a log, the view including a portion of a cross-cut saw in operation.

-In forming the constructionalembodiment of the invention as illustrated. the spike or dog 10 base front sharpened end 10 as usual, to be driven into the log 25, and the spike carries the sawsup'porting arm ill, which is formed at its lower endv with a lateral stud arm 12, that carries a friction roller 13 of any approved form.

Specification of Letters I'at'eiit.

' atcuted Feb. 35,1913.

1912. Serial No. 698,687.

In order that the guide arm and its roller. may he sup' 'io'rtcd adjustahly on the shank without weakeniu; either the shank 'or the arm by boring or slottiinnl provide a noncircular sleeve 1--l-, preferably rectangular, the shank of the spike l0 being, also rectangular. The said sleeve 14 is formed with elongated slots to, H3, in the two opposite sides and in line with each other, said slots being or greater length than the width of the guide arm 1]., so as to receive the same in a position either perpendicular to the slew e, or at various angles, as will be readily understood. The bore or interior of the sleeve 1-! ot" a size in a direction transverse to the direction of thetwo slots 15, 16, that the said sleeve accommodates both the shank of the spike 10 and the arm 11. A further adjustment of the arm' 11 is possible in that the said arm may be inserted lengthwise in the sleeve 14-, so that the sleeve and the shank of the spike will range lengthwise of each other in parallel planes.

In order to bind the sleeve at any desired point along the shank of the spike, and also in order to bind the arm 11 at any given adjustment, a set screw 17 is provided, which takes into a threaded hole 18 in one side face of the sleeve 14, the said screw being bent laterally to form a lever handle 19.

The saw 30 rests with its back edge in one inserted in the slots 15, '16, from the under side so that the roller 13 will be below the spike 10, or the said arm may be inserted trom the upper side of the sleeve, passing from the slot 15 tothe slot ltl, whereby the roller 13 will be above the spike, and whether the arm be inserted from the top or bottom of the sleeve it is capable of the angula r adjustment relatively tothe length of the spike, and these various adjustments. coupled with the provision for inserting the saw-guide arm cnd'wise et the latter. en ables the operator to provide support for the saw in such a multiplicity of positirims that a kerf' may be produced ('lescribing a complete circle around a log. It will tun thermore be seen that the adjustments are etiected without slotting perforating, or otherwise weakening either the spike or the guide am.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent,

An undercut saw guide, spike adapted to be driven into a lo an element slidably fitting the shank 0 the spike and formed with oblong, alined slots, an arm carrying a saw-guiding member, said arm being accommodated 'in thesaid slots with one side lying against the interior side surface of the element in which the slots are formed, the

comprising :1

arm furthermore being rockable in the slots av various angles to the vertical, and means for binding the said arm against the mentioned interior sur- 15 face.

In testimony whereof I have name to this specification in the tWo subscribing witnesses.

I JAMES WILLIAM DONAHUE. Witnesses: I

F REnnRIo W. DAMITZ, CHARLES M T'fi signed my presence of 

